Shimano deore m610 10 speed rear mechwide link shadow design dyna sys 10 speed top normal deore rear derailleurfeatures shadow features a super low profile design that reduces the risk of damage from trail side hazards direct mount compatible rear derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chainstays increase axel sizes and move suspension pivots single tension spring prevents contact with t